APA (7th ed.) Citation

Sally Grindley. (1995). Knock Knock Whos there. Hardback.

Chicago Style (17th ed.) Citation

Sally Grindley. Knock Knock Whos There. London: Hardback, 1995.

MLA (9th ed.) Citation

Sally Grindley. Knock Knock Whos There. Hardback, 1995.

Warning: These citations may not always be 100% accurate.